Physics-
General
Easy

Question

Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R = 1 ohm. If the internal resistance of battery A is 1.9 ohms and that of B is 0.9 ohm, what is the potential difference between the terminals of battery A

  1. 2 V    
  2. 3.8 V    
  3. Zero    
  4. None of the above    

The correct answer is: Zero


    i equals fraction numerator 2 plus 2 over denominator 1 plus 1.9 plus 0.9 end fraction equals fraction numerator 4 over denominator 3.8 end fraction A
    For cell A E equals V plus i r ÞV equals 2 minus fraction numerator 4 over denominator 3.8 end fraction cross times 1.9 equals 0.

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